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PMID:22540282
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| Citation |
Riewe, D, Koohi, M, Lisec, J, Pfeiffer, M, Lippmann, R, Schmeichel, J, Willmitzer, L and Altmann, T (2012) A tyrosine aminotransferase involved in tocopherol synthesis in Arabidopsis. Plant J. 71:850-859 |
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| Abstract |
The metabolic function of the predicted Arabidopsis tyrosine aminotransferase (TAT) encoded by the At5g53970 gene was studied using two independent knock-out mutants. Gas chromatography-mass spectrometry based metabolic profiling revealed a specific increase in tyrosine levels, supporting the proposed function of At5g53970 as a tyrosine-specific aminotransferase not involved in tyrosine biosynthesis, but rather in utilization of tyrosine for other metabolic pathways. The TAT activity of the At5g53970-encoded protein was verified by complementation of the Escherichia coli tyrosine auxotrophic mutant DL39, and in vitro activity of recombinantly expressed and purified At5g53970 was found to be specific for tyrosine. To investigate the physiological role of At5g53970, the consequences of reduction in tyrosine utilization on metabolic pathways having tyrosine as a substrate were analysed. We found that tocopherols were substantially reduced in the mutants and we conclude that At5g53970 encodes a TAT important for the synthesis of tocopherols in Arabidopsis. |
| Links |
PubMed Online version:10.1111/j.1365-313X.2012.05035.x |
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